Books like Mortal Questions
Thomas Nagel
Mortal Questions is 216 pages, about 3 hours 58 minutes at 250 words a minute.
8 books to read next
How long each takes
Meditations 3.7 h 
Freedom from the Known 2.4 h 
This I Believe 5.3 h 
Better Never to Have Been 4.5 h 
Essais 36.2 h 
The Sovereignty of Good 2.0 h 
The Inner Citadel 6.4 h 
What I Believe 1.7 h Bar height shows length. Estimated at 250 words a minute.